CN219960586U - Optical fiber-based signal transmission system - Google Patents
Optical fiber-based signal transmission system Download PDFInfo
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- CN219960586U CN219960586U CN202321072625.XU CN202321072625U CN219960586U CN 219960586 U CN219960586 U CN 219960586U CN 202321072625 U CN202321072625 U CN 202321072625U CN 219960586 U CN219960586 U CN 219960586U
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Abstract
The utility model discloses an optical fiber-based signal transmission system, which comprises an error amplifier, a voltage-to-current conversion module, a laser emission module, a first optical fiber, a first beam splitter, a second optical fiber, a third optical fiber, a fourth optical fiber, an optical power detector and an optical power feedback amplification module, wherein the first optical fiber is connected with the first optical fiber; the size of the feedback optical signal received by the optical power detector is still in direct proportion to the size of the optical signal output by the optical signal output end, and is irrelevant to the attenuation of the optical fiber, namely the transmission characteristic of the signal transmission system is not influenced by the bending of the optical fiber. Since the bending of the optical cable does not affect the transmission characteristics, maintenance costs and frequency can be reduced. The signal transmission system of the scheme has stronger adaptability because of being not influenced by the bending of the optical cable, and can be applied to various environments and conditions.
Description
Technical Field
The utility model relates to the technical field of optical fiber signal transmission, in particular to a signal transmission system based on optical fibers.
Background
In the optical fiber transmission technology, a common method is to perform current modulation on a Laser Diode (LD) or a Light Emitting Diode (LED), and transmit a generated optical signal into an optical fiber for transmission of several tens of meters. The receiving end adopts a photodiode and an amplifier to convert the optical signal into an electric signal output (VOUT). However, since the optical fiber is bent and installed, a tiny signal attenuation is caused, so that an electric signal output by the receiving end is weakened, and the performance characteristics of the whole signal transmission system are affected.
Disclosure of Invention
The embodiment of the utility model provides a signal transmission system, which aims to solve the problem that the performance characteristics of the whole signal transmission system are affected due to the fact that an optical fiber in an optical transmission channel is bent in the prior art.
A first aspect of an embodiment of the present utility model provides an optical fiber-based signal transmission system, including:
the first input end of the error amplifier is connected with a voltage input signal, and the second input end of the error amplifier is connected with a voltage feedback signal and is used for obtaining a voltage error signal according to the voltage input signal and the voltage feedback signal;
the input end of the voltage-to-current conversion module is connected with the output end of the error amplifier and is used for converting the voltage error signal into a first current signal;
the laser emission module is positioned at the optical signal input end, and the input end of the laser emission module is connected with the output end of the voltage-to-current conversion module and is used for converting the first current signal into a first optical signal and a second optical signal;
the first optical fiber is positioned in the optical signal transmission channel, and the input end of the first optical fiber is connected with the first output end of the laser emission module and is used for transmitting a first optical signal;
the second optical fiber is positioned at the optical signal input end, and the input end of the second optical fiber is connected with the second output end of the laser emission module and is used for transmitting the second optical signal;
the first optical splitter is positioned at the optical signal output end, and the input end of the first optical splitter is connected with the output end of the first optical fiber and is used for dividing the first optical signal into a third optical signal and a fourth optical signal according to a preset proportion;
the third optical fiber is positioned in the optical signal transmission channel, and the input end of the third optical fiber is connected with the first output end of the first optical splitter and is used for transmitting the third optical signal;
the fourth optical fiber is positioned at the optical signal output end, and the input end of the fourth optical fiber is connected with the second output end of the first optical splitter and is used for transmitting the fourth optical signal to the output port;
the input end of the optical power detector is connected with the output end of the second optical fiber and the output end of the third optical fiber and is used for converting the second optical signal and the third optical signal into a second current signal;
and the input end of the optical power feedback amplification module is connected with the output end of the optical power detector and is used for amplifying the second current signal and forming a voltage feedback signal to be fed back to the error amplifier.
Preferably, the ratio of the light intensity of the first optical signal to the light intensity of the second optical signal is 2:1.
Preferably, the ratio of the light intensity of the third light signal to the light intensity of the fourth light signal is 1:1.
Preferably, the ratio of the light intensity of the optical signal output by the output port to the light intensity of the optical signal at the input end of the optical power detector is 1:2.
Preferably, the lengths of the first optical fiber and the third optical fiber in the optical signal transmission channel are the same.
Preferably, the length of the second optical fiber and the length of the fourth optical fiber are both smaller than the length of the first optical fiber.
The technical effects of the embodiment of the utility model are as follows: the optical power detector is used for receiving the feedback optical signal, the size of the feedback optical signal is in direct proportion to the size of the output optical signal, and the feedback optical signal is irrelevant to the attenuation of the optical fiber, so that the influence of the bending of the optical cable on the transmission characteristic of the signal transmission system is overcome. The scheme has stronger adaptability because of being not influenced by the bending of the optical cable, and is suitable for various environments and conditions. Compared with the traditional optical fiber transmission system, the transmission distance of the scheme is longer, the transmission speed is faster and more stable, and the maintenance cost is lower. This is because the bending of the cable of this solution does not affect the transmission characteristics, and the transmission of the optical signal is not limited by the scattering and loss of light.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments of the present utility model will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an optical fiber-based signal transmission system according to an embodiment of the present utility model;
fig. 2 is a circuit diagram of a voltage-to-current conversion module in an optical fiber-based signal transmission system according to an embodiment of the present utility model;
fig. 3 is a schematic structural diagram of a laser emitting module in an optical fiber-based signal transmission system according to an embodiment of the present utility model;
fig. 4 is a circuit diagram of an optical power feedback amplifying module in an optical fiber-based signal transmission system according to an embodiment of the present utility model;
in the figure: 101. an error amplifier; 102. a press flow conversion module; 103. a laser emitting module; 104. a first optical fiber; 105. a first beam splitter; 106. a fourth optical fiber; 107. a third optical fiber; 108. a second optical fiber; 109. an optical power detector; 110. and the optical power feedback amplifying module.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be understood that the present utility model may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art. In the drawings, the dimensions and relative dimensions of layers and regions may be exaggerated for the same elements throughout for clarity.
It will be understood that when an element or layer is referred to as being "on" …, "" adjacent to "…," "connected to" or "coupled to" another element or layer, it can be directly on, adjacent to, connected to or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on" …, "" directly adjacent to "…," "directly connected to" or "directly coupled to" another element or layer, there are no intervening elements or layers present. It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present utility model.
Spatially relative terms, such as "under …," "under …," "below," "under …," "above …," "above," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use and operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "under" or "beneath" other elements would then be oriented "on" the other elements or features. Thus, the exemplary terms "under …" and "under …" may include both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of the associated listed items.
In the following description, for the purpose of providing a thorough understanding of the present utility model, detailed structures and steps are presented in order to illustrate the technical solution presented by the present utility model. Preferred embodiments of the present utility model are described in detail below, however, the present utility model may have other embodiments in addition to these detailed descriptions.
As shown in fig. 1, the first embodiment of the present utility model provides a signal transmission system based on an optical fiber, where the signal transmission system includes:
the error amplifier 101 has a first input terminal connected to the voltage input signal and a second input terminal connected to the voltage feedback signal, and is configured to obtain a voltage error signal according to the voltage input signal and the voltage feedback signal;
the input end of the voltage-to-current conversion module 102 is connected with the output end of the error amplifier 101 and is used for converting the voltage error signal into a first current signal;
the laser emission module 103 is located at the optical signal input end 10, and the input end of the laser emission module is connected with the output end of the voltage-to-current conversion module 102 and is used for converting the first current signal into a first optical signal;
the first optical fiber 104 is located in the optical signal transmission channel 20, and its input end is connected to the output end of the laser emission module 103, and is used for transmitting a first optical signal;
a second optical fiber 108, which is located at the optical signal input end 10, and the input end of which is connected to the second output end of the laser emitting module 103, and is used for transmitting a second optical signal;
the first optical splitter 105 is located at the optical signal output end 30, and an input end of the first optical splitter is connected to an output end of the first optical fiber 104, and is used for splitting the first optical signal into a third optical signal and a fourth optical signal according to a preset proportion;
a third optical fiber 107, which is located in the optical signal transmission channel 20, and has an input end connected to the second output end of the first optical splitter 105, and is used for transmitting a third optical signal;
a fourth optical fiber 106, located at the optical signal output end 30, having an input end connected to the second output end of the first optical splitter, for transmitting the fourth optical signal to an output port;
an optical power detector 109 having an input terminal connected to the output terminal of the second optical fiber 108 and the output terminal of the third optical fiber 107, for converting the second optical signal and the third optical signal into a second current signal;
the input end of the optical power feedback amplifying module 110 is connected to the output end of the optical power detector 109, and is used for amplifying the second current signal and forming a voltage feedback signal to be fed back to the error amplifier 101.
For the voltage-to-current conversion module 102, two complementary current source circuits are provided, and the static working current flowing into the laser emitting module 103 is adjusted by adjusting the impedance between the current source circuits. Specifically, as shown in fig. 2, the voltage-to-current conversion module 102 includes a triode Q1, a triode Q2, a triode Q3, a triode Q4, a resistor R8, a resistor R9, and an adjustable resistor R10, where the triode Q1, the triode Q3, and the resistor R8 form a first current source branch, the triode Q2, the triode Q4, and the resistor R9 form a second current source branch, a base of the triode Q1 is connected with an input voltage V2, one end of the adjustable resistor R10 is connected between an emitter of the triode Q1 and a collector of the triode Q3, the other end of the adjustable resistor R10 is connected between an emitter of the triode Q2 and a collector of the triode Q4, and a base of the triode Q3 and a base of the triode Q4 are commonly connected with a second reference voltage V REF2 Which is provided withThe adjustable resistor R10 is a gain adjusting resistor whose voltage is converted into a laser diode current. The specific working mode is as follows:
1. regulating the second reference voltage V REF2 The quiescent operating current IS flowing through the laser diode in the laser emitting module 103 can be adjusted. The quiescent operating current IS when the input voltage V2 IS 0, the laser diode still has a quiescent current IS, and the laser diode emits a quiescent optical power. Setting r8=r9, vbe=0.7v of the transistor, the current flowing through transistor Q3 and transistor Q4 is:
I 1 ＝I 2 ＝(V REF2 -0.7V)/R8；
and current I of laser diode LD1 ＝I 1 -I 3 ；
Wherein I is 3 I when static v2=0, determined by the input voltage V2 3 0, so adjust V REF2 The quiescent current IS of the laser diode can be adjusted.
2. The input voltage V2 will lead to a current I when it is large 3 Linearly increasing.
Transistor Q1 is connected to an emitter follower so v6=v2-0.7V, i.e. V6 follows the input voltage V2. The base of transistor Q2 is grounded through a resistor, so V7 is constant at about-0.7V.
Current I flowing through R10 3 = (V2-0.7V- (-0.7V))/r10=v2/R10, so I 3 Is linearly increased as the input voltage VIN increases, and the variable resistor R10 is adjusted to change the input voltage to cause I 3 A varying gain factor.
3、I 3 Is increased resulting in a current I of the laser diode LD1 And becomes smaller.
I 1 From V REF2 The decision is a constant value, the current I of the laser diode LD1 ＝I 1 -I 3 ；
So I 3 Is directly caused to I LD1 And becomes smaller.
In summary, the piezoelectric conversion module of the present embodiment has the following functions:
1. regulation V REF2 The quiescent operating current of the laser diode can be adjusted: is= (V) REF2 -0.7V)/R8, typically 20-30MA.
2. Laser diode I LD1 The relation between the current variation and the input voltage V2 is DeltaI LD1 ＝V2/R10。
When the input voltage VIN becomes smaller, the process is similar, finally leading to I LD1 And becomes larger. The principle and technical effect of the linear power amplifier for controlling the luminous current of the laser diode is to firstly adjust the static working current of the laser diode so that the laser diode works in a linear interval far from the threshold current. Then, the current variation of the laser diode linearly follows the variation of the input voltage V2, and the process of linearly converting the input voltage signal into laser light power is completed.
As shown in fig. 3, for the laser emitting module 103, the laser emitting module 103 includes:
a laser diode LD1 for converting the first current signal into a first optical signal;
the optical coupler L1 is configured to couple the first optical signal and send the first optical signal into the first optical fiber 104 for transmission.
A laser diode LD2 for converting the first current signal into a second optical signal;
and the optical coupler L2 is configured to couple the second optical signal and send the second optical signal into the second optical fiber 108 for transmission.
The laser emitting module 103 emits a first optical signal and a second optical signal, the first optical fiber 104 transmits the first optical signal to the first optical splitter 105, the second optical fiber 108 transmits the second optical signal to the optical power detector 109, the first optical splitter 105 splits the second optical signal into a third optical signal and a fourth optical signal, and a ratio of light intensity of the third optical signal to light intensity of the fourth optical signal is 1:1. The second optical fiber 108 transmits a second optical signal to the output port. The third optical fiber 107 is a feedback optical fiber, and the third optical fiber 107 transmits a third optical signal to the optical power detector 109 at the input end of the optical signal transmission channel.
Since the first optical fiber 104 and the third optical fiber 107 are both located inside the same optical cable, when the optical cable is bent, the attenuation amount of each optical fiber is the same, and is defined as X, which is generally less than 5%.
Wherein the length of the fourth optical fiber 106 and the length of the second optical fiber 108 are both less than the length of the first optical fiber 104. The two fibers are not bent, and thus can be regarded as having no attenuation.
Wherein the optical power detector 109 is used to convert the optical signal into a current signal.
As shown in fig. 4, the optical power feedback amplifying module 110 includes an operational amplifier A2 and a variable resistor R6, the non-inverting input terminal of the operational amplifier A2 is connected to a first reference voltage, and the current output by the optical power detector 109 is amplified by the operational amplifier A2 to an output voltage V3. Since the photodiode current IPD1 is proportional to the optical power emitted from the laser LD1, the output voltage V3 is in a very good linear proportional relationship with the optical power of the laser diode LD 1. Wherein the bandwidth of the optical power detection circuit is not higher than 1MHZ.
Wherein the signal transmission system further comprises:
the input end of the photoelectric conversion module 120 is connected to the output port 121, and is used for converting the optical signal output by the output port 121 into an electrical signal.
The principle of transmitting optical signals by the optical fiber transmission channel in this embodiment is as follows: assuming that the light intensity of the first optical signal emitted by the laser emitting module 103 is 2, the light intensity of the second optical signal emitted by the laser emitting module 103 is 1, the light intensity of the first optical signal transmitted by the first optical fiber 104 to the first optical splitter is 2 (1-X), the light intensity of the second optical signal transmitted by the second optical fiber 108 to the optical power detector 109 is 1, the light intensity of the third optical signal output by the first optical splitter 105 is 1-X, the light intensity of the fourth optical signal output by the first optical splitter 105 is 1-X, the third optical fiber 107 transmits the third optical signal back to the optical power detector 109, and the light intensity of the third optical signal after light intensity attenuation is (1-X) × (1-X). The total light intensity of the optical signal entering the optical power detector 109 is the sum of the light intensity of the optical signal output from the second optical fiber 108 and the light intensity of the optical signal output from the third optical fiber 107, which is:
1+(1-X)×(1-X)＝1+1+X×X-2X；
because X is less than 5% = 0.05, X is less than 0.0025 is much less than X, which is negligible in the equation above. The total light intensity of the optical signal entering the optical power detector 109 is approximately 2 (1-X). Therefore, when the optical cable is bent, the relationship between the total light intensity of the optical signal entering the optical power detector 109 and the light intensity of the optical signal output from the output port is 2 times constant, and it is understood that the relationship between the light intensities of the optical signals on both sides of the optical signal transmission channel is independent of the attenuation amount X of the optical fiber.
It can be seen that when the optical cable is bent, the intensity of the light received by the optical power detector 109 is still proportional to the intensity of the light signal output by the optical signal output end, and is irrelevant to the attenuation X of the optical fiber, i.e. the transmission characteristic of the signal transmission system is not affected by the bending of the optical fiber.
The technical scheme of the utility model is as follows: the optical power detector is used for receiving the feedback optical signal, the size of the feedback optical signal is in direct proportion to the size of the output optical signal, and the feedback optical signal is irrelevant to the attenuation of the optical fiber, so that the influence of the bending of the optical cable on the transmission characteristic of the signal transmission system is overcome. The scheme has stronger adaptability because of being not influenced by the bending of the optical cable, and is suitable for various environments and conditions. Compared with the traditional optical fiber transmission system, the transmission distance of the scheme is longer, the transmission speed is faster and more stable, and the maintenance cost is lower. This is because the bending of the cable of this solution does not affect the transmission characteristics, and the transmission of the optical signal is not limited by the scattering and loss of light.
The above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model, and are intended to be included in the scope of the present utility model.
Claims (6)
1. An optical fiber-based signal transmission system, the signal transmission system comprising:
the first input end of the error amplifier is connected with a voltage input signal, and the second input end of the error amplifier is connected with a voltage feedback signal and is used for obtaining a voltage error signal according to the voltage input signal and the voltage feedback signal;
the input end of the voltage-to-current conversion module is connected with the output end of the error amplifier and is used for converting the voltage error signal into a first current signal;
the laser emission module is positioned at the optical signal input end, and the input end of the laser emission module is connected with the output end of the voltage-to-current conversion module and is used for converting the first current signal into a first optical signal and a second optical signal;
the first optical fiber is positioned in the optical signal transmission channel, and the input end of the first optical fiber is connected with the first output end of the laser emission module and is used for transmitting a first optical signal;
the second optical fiber is positioned at the optical signal input end, and the input end of the second optical fiber is connected with the second output end of the laser emission module and is used for transmitting the second optical signal;
the first optical splitter is positioned at the optical signal output end, and the input end of the first optical splitter is connected with the output end of the first optical fiber and is used for dividing the first optical signal into a third optical signal and a fourth optical signal according to a preset proportion;
the third optical fiber is positioned in the optical signal transmission channel, and the input end of the third optical fiber is connected with the first output end of the first optical splitter and is used for transmitting the third optical signal;
the fourth optical fiber is positioned at the optical signal output end, and the input end of the fourth optical fiber is connected with the second output end of the first optical splitter and is used for transmitting the fourth optical signal to the output port;
the input end of the optical power detector is connected with the output end of the second optical fiber and the output end of the third optical fiber and is used for converting the second optical signal and the third optical signal into a second current signal;
and the input end of the optical power feedback amplification module is connected with the output end of the optical power detector and is used for amplifying the second current signal and forming a voltage feedback signal to be fed back to the error amplifier.
2. The signal transmission system of claim 1, wherein a ratio of the light intensity of the first optical signal to the light intensity of the second optical signal is 2:1.
3. The signal transmission system of claim 2, wherein a ratio of the light intensity of the third optical signal to the light intensity of the fourth optical signal is 1:1.
4. A signal transmission system as claimed in claim 3 wherein the ratio of the optical power of the optical signal output by the output port to the optical power of the optical signal at the input of the optical power detector is 1:2.
5. The signal transmission system of claim 1, wherein the first optical fiber and the third optical fiber in the optical signal transmission channel are the same length.
6. The signal transmission system of claim 4, wherein the length of the second optical fiber and the length of the fourth optical fiber are each less than the length of the first optical fiber.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117270622A (en) * | 2023-11-21 | 2023-12-22 | 深圳市知用电子有限公司 | Pressure current converting circuit, transmitter and signal transmission system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117270622A (en) * | 2023-11-21 | 2023-12-22 | 深圳市知用电子有限公司 | Pressure current converting circuit, transmitter and signal transmission system |
| CN117270622B (en) * | 2023-11-21 | 2024-01-19 | 深圳市知用电子有限公司 | Pressure current converting circuit, transmitter and signal transmission system |
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